This patch changes all AArch64 assembly code to use:
  ret     x<n>
instead of:
  br      x<n>

"ret x<n>" is already used in a lot of places so this patch makes it
consistent across the code base. This does not change behavior or

In addition, this change reduces the number of landing pads needed in
a subsequent patch to support the Armv8.5-A Branch Target
Identification (BTI) security feature.

Regression tested and no issues. Could someone take a look and

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Attachment: 0001-aarch64-Use-ret-x-n-instead-of-br-x-n-where-possible.patch
Description: 0001-aarch64-Use-ret-x-n-instead-of-br-x-n-where-possible.patch

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